An American Airlines plane returned to Chicago’s O’Hare International Airport Tuesday morning over a potential odor in the cabin as passengers reported possible smoke.

American Airlines said in a statement that flight 2587 from Chicago to Dallas Forth Worth returned to Chicago after the crew reported a “possible odor in the cabin.”

“The aircraft, an Airbus 321 with 175 passengers and a crew of six, landed safely and taxied to the gate,” the statement read. “The aircraft will be evaluated by our maintenance team, and we apologize to our customers for the inconvenience.”

“Happening right now… Texts from my dad enroute to Tokyo on @AmericanAir via ORD to Dallas — ‘smoke in cockpit, making emergency landing,'” a tweet from Bruce Clark read just after 9 a.m.

The airline said in a tweet Tuesday that passengers on the plane were expected to be moved to a new aircraft.

“Safety is a top priority and we’ll have your dad on his way soon,” the airline said in response to the tweet.